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Cytotoxicity, Exhaustion, and Immunosenescence in CD8+ T Cells During Aging and Infection
Cytotoxicity, Exhaustion, and Immunosenescence in CD8+ T Cells During Aging and Infection
Detailed Information
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202104653
- ISBN
- 9798290909615
- DDC
- 616.079
- 서명/저자
- Cytotoxicity, Exhaustion, and Immunosenescence in CD8+ T Cells During Aging and Infection
- 발행사항
- [Sl] : University of Minnesota, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 164 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-01, Section: B.
- 주기사항
- Advisor: Camell, Christina D.
- 학위논문주기
- Thesis (Ph.D.)--University of Minnesota, 2025.
- 초록/해제
- 요약Aging is associated with a decline in immune function, increasing susceptibility to infections, and reducing the efficacy of immunotherapies. This dissertation investigates the mechanisms driving CD8+ T cell dysfunction during aging, focusing on T cell exhaustion and immunosenescence during infection. Using mouse models, I examined how programmed cell death protein 1 (PD1) blockade affects CD8+ T cells in aged mice exposed to lethal microbial exposure (NME). I demonstrate that infection exacerbates CD8+ T cell exhaustion in aged mice, with increased expression of inhibitory receptors (PD1) and diminished effector function. PD1 checkpoint blockade improved survival in old mice by enhancing CD8+ T cell cytotoxic capacity, without increasing inflammation. To further characterize functional capacity, I validated an in vivo assay to assess degranulation (cytotoxicity) in old mice. Using this approach, I found that CD8+ T cells from old mice retain the ability to degranulate in vivo upon aCD3 stimulation, but not during LCMV-Armstrong or Cohousing (CoH or NME). Finally, I explored how the duration and timing of antigen exposure and cytokines, such as interleukin-10 (IL-10), alter CD8+ T cell exhaustion. I determined that long-term NME exposure reduces inflammatory cytokine gene expression and the frequency of CD8+ CD44+ PD1+ T cells. Additionally, IL-10 neutralization ablates the protective effects of anti-PD1 during NME challenge. Together, these studies provide mechanistic insight into how age and environmental challenges impair CD8+ T cell function. My findings reveal potential therapeutic strategies to restore CD8+ T cell function and resilience in aged individuals.
- 일반주제명
- Immunology
- 일반주제명
- Aging
- 일반주제명
- Molecular biology
- 일반주제명
- Cellular biology
- 일반주제명
- Oncology
- 키워드
- CD8+ T cells
- 키워드
- Cytotoxicity
- 키워드
- Infections
- 키워드
- Inflammation
- 키워드
- Cell function
- 기타저자
- University of Minnesota Biochemistry Molecular Bio and Biophysics
- 기본자료저록
- Dissertations Abstracts International. 87-01B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202104653
■006m o d
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■020 ▼a9798290909615
■035 ▼a(MiAaPQ)AAI32115612
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a616.079
■1001 ▼aDahlquist, Korbyn Joy Vera.
■24510▼aCytotoxicity, Exhaustion, and Immunosenescence in CD8+ T Cells During Aging and Infection
■260 ▼a[Sl]▼bUniversity of Minnesota▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a164 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-01, Section: B.
■500 ▼aAdvisor: Camell, Christina D.
■5021 ▼aThesis (Ph.D.)--University of Minnesota, 2025.
■520 ▼aAging is associated with a decline in immune function, increasing susceptibility to infections, and reducing the efficacy of immunotherapies. This dissertation investigates the mechanisms driving CD8+ T cell dysfunction during aging, focusing on T cell exhaustion and immunosenescence during infection. Using mouse models, I examined how programmed cell death protein 1 (PD1) blockade affects CD8+ T cells in aged mice exposed to lethal microbial exposure (NME). I demonstrate that infection exacerbates CD8+ T cell exhaustion in aged mice, with increased expression of inhibitory receptors (PD1) and diminished effector function. PD1 checkpoint blockade improved survival in old mice by enhancing CD8+ T cell cytotoxic capacity, without increasing inflammation. To further characterize functional capacity, I validated an in vivo assay to assess degranulation (cytotoxicity) in old mice. Using this approach, I found that CD8+ T cells from old mice retain the ability to degranulate in vivo upon aCD3 stimulation, but not during LCMV-Armstrong or Cohousing (CoH or NME). Finally, I explored how the duration and timing of antigen exposure and cytokines, such as interleukin-10 (IL-10), alter CD8+ T cell exhaustion. I determined that long-term NME exposure reduces inflammatory cytokine gene expression and the frequency of CD8+ CD44+ PD1+ T cells. Additionally, IL-10 neutralization ablates the protective effects of anti-PD1 during NME challenge. Together, these studies provide mechanistic insight into how age and environmental challenges impair CD8+ T cell function. My findings reveal potential therapeutic strategies to restore CD8+ T cell function and resilience in aged individuals.
■590 ▼aSchool code: 0130.
■650 4▼aImmunology
■650 4▼aAging
■650 4▼aMolecular biology
■650 4▼aCellular biology
■650 4▼aOncology
■653 ▼aCD8+ T cells
■653 ▼aCytotoxicity
■653 ▼aImmune checkpoint blockade
■653 ▼aInfections
■653 ▼aInflammation
■653 ▼aCell function
■690 ▼a0982
■690 ▼a0493
■690 ▼a0307
■690 ▼a0379
■690 ▼a0992
■71020▼aUniversity of Minnesota▼bBiochemistry, Molecular Bio, and Biophysics.
■7730 ▼tDissertations Abstracts International▼g87-01B.
■790 ▼a0130
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358385▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
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